1136 GRAND AVE A&B 2016-01-01 MF Import

� ; August 25,2006 Nir. Scott Anderson I,&A Job No. 6A 126 Page 3 medium-dense state, and is moderatcly permeable and compressible. The underlying fresh till is very dense and is practically impervious to stormwater infiltration. The fresh till has the strength of low-grade concrete and can stand in a steep natuial or cut slope for a long period. If remains undisturbed nnd well-drained, the fresh till can provide ezcellent foundation support with little setticment expected. The advance outwnsh soil unit underlying the Vashon tilf is composed of stratified sand and gmvel with minor�unounts of silt und clay, deposited by the meltwater of advancing glacial ice. Due to their generally granulaz composition, the advance outwash deposits are of modecately high pertneabiliry and generally drains fairly well. The advance outwash deposits are glacially overcidden and aze generally dense to very densc in its natw�il, undisturbed state, except the top 2 to 4 feet where exposcd on slopes which ma� be weathered to a loose to medium-dense state. The adva��ce outwash deFwsits can stand in stcep cuts or natural slopes for extended period when undisturbed. Where exposed on slopes with poor vegetation cover and subject to storm runoff or groundwater seepage, the advance outwash deposits can be gradually eroded and may slough and redeposit to a flatter inclination. The undedying fresh advance outwash deposits in iheir native, undisturbed state can rrovidc good foundation support with litile settlement expected for light to moderate residential structures. A steel T-bar was manually pushed into the surficial soils from the east boundary of the site to the crest of the steep slo� in the westem portion of the site to get an indication of the density or consistency of the soils. The probe could penetrate to about 6 to 10 ii..hes in the front yard and to nbout two fcet in the backyard. 11�e g�ound probing results indicate that the site is most likcly underlain by very-dense, Cresh till soils at very shallow depQ�. LIU & ASSOCIATES, INC.